Pseudomonas spp. diversity is negatively associated with suppression of the wheat take-all pathogen.
Pseudomonas spp. diversity is negatively associated with suppression of the wheat take-all pathogen.
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DOI：
10.1038/srep29905
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发表时间：
2016-08-23
影响因子：
4.6
通讯作者：
Mauchline TH
中科院分区：
文献类型：
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作者：
Mehrabi Z;McMillan VE;Clark IM;Canning G;Hammond-Kosack KE;Preston G;Hirsch PR;Mauchline TH
生物多样性和生态系统功能研究通常表明多样性与生产力之间存在积极的关系。然而，物种丰富度的局部增加会增加营养级内的竞争，从而降低营养级种群控制的有效性。假单胞菌属是土壤细菌的优势群体，在促进植物生长和控制作物真菌病原体方面发挥着关键作用。在这里，我们展示了假单胞菌属。丰富度与小麦全食病和田间约 3 吨/公顷的产量损失呈正相关。我们在抽象的实验微观世界中模拟了假单胞菌和全食病原体之间的相互作用，结果表明，细菌基因型丰富度的增加会加剧细菌的拮抗作用，并降低细菌群落抑制全食病原体生长的能力。未来的工作需要确定这些负面生物多样性影响对不同介质和直接在根表面感染区域的普遍性。然而，高基因型丰富度下细菌之间竞争的加剧以及真菌生物防治活性的潜在丧失凸显了解释我们在田间观察到的假单胞菌多样性与小麦产量负关系的重要机制。我们的结果表明，生物多样性对生态系统功能的影响可能取决于感兴趣的功能和营养水平。
Biodiversity and ecosystem functioning research typically shows positive diversity- productivity relationships. However, local increases in species richness can increase competition within trophic levels, reducing the efficacy of intertrophic level population control. Pseudomonas spp. are a dominant group of soil bacteria that play key roles in plant growth promotion and control of crop fungal pathogens. Here we show that Pseudomonas spp. richness is positively correlated with take-all disease in wheat and with yield losses of ~3 t/ha in the field. We modeled the interactions between Pseudomonas and the take-all pathogen in abstract experimental microcosms, and show that increased bacterial genotypic richness escalates bacterial antagonism and decreases the ability of the bacterial community to inhibit growth of the take-all pathogen. Future work is required to determine the generality of these negative biodiversity effects on different media and directly at infection zones on root surfaces. However, the increase in competition between bacteria at high genotypic richness and the potential loss of fungal biocontrol activity highlights an important mechanism to explain the negative Pseudomonas diversity-wheat yield relationship we observed in the field. Together our results suggest that the effect of biodiversity on ecosystem functioning can depend on both the function and trophic level of interest.